CN105790720A - Dual-mode efficiency enhanced type linear power amplifier - Google Patents
Dual-mode efficiency enhanced type linear power amplifier Download PDFInfo
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- CN105790720A CN105790720A CN201610246198.0A CN201610246198A CN105790720A CN 105790720 A CN105790720 A CN 105790720A CN 201610246198 A CN201610246198 A CN 201610246198A CN 105790720 A CN105790720 A CN 105790720A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
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Abstract
The invention discloses a dual-mode efficiency enhanced type linear power amplifier. The dual-mode efficiency enhanced type linear power amplifier comprises a two-stage power amplifying circuit of an LIPA (load insensitive power amplifier) structure and an output circuit, wherein the two-stage power amplifying circuit of the LIPA structure consists of a 45-degree phase shift type two-stage amplifying branch circuit and a -45-degree phase shift type two-stage amplifying branch circuit. The dual-mode efficiency enhanced type linear power amplifier is characterized in that the output circuit consists of a branch circuit A and a branch circuit B, wherein the branch circuit A comprises an inductor L8, a capacitor C6, an inductor L10 and a capacitor C5, the branch circuit B comprises an inductor L9, a capacitor C7 and a capacitor C3, and a pole of the capacitor C3 in the branch circuit B and the output end of the inductor L10 in the branch circuit A are connected with the power output end RFOUT. The dual-mode efficiency enhanced type linear power amplifier has the advantages that one part of components are removed to decrease the number of the components, so that the whole design is cheaper, system complexity is lowered and system reliability is improved.
Description
Technical field
The present invention relates to a kind of power amplifier, specifically a kind of bimodulus efficiency linear power amplifier.
Background technology
Efficient LIPA(LoadInsensitivePowerAmplifier, the i.e. insensitive power amplifier of load) allow, under low output level, still there is good PAE(Power-AddedEfficiency, i.e. power added efficiency).But, it is fine that the PAE that this high efficiency LIPA has can not show under various power, in order to improve the PAE of LIPA, proposing bimodulus enhanced efficiency linear power amplifier design, this method makes high efficiency LIPA have better PAE in high-power output level and low-power output level exactly simultaneously.Current phone supplier needs the mobile phone of more cheap, less and better performance.For WCDMA/CDMA power amplifier, under high-output power level and low output level, improve PAE simultaneously, be the demand of current great competitiveness.
In 2005, the high efficiency LIPA of a kind of novelty has invented in Skyworks company, as shown in Figure 1, it includes two stage power amplifying circuit and the output circuit of LIPA structure, wherein, the two stage power amplifying circuit of described LIPA structure is amplified branch circuit by 45 degree of phase shift two-stages and negative 45 degree of phase shift two-stages are amplified branch circuit and constituted.This amplifier allows still have good PAE under low output level, and will not sacrifice its performance and the linearity under other output levels.This switching mode LIPA operates very well always.Its output circuit is by output phase shifter of upper channel and lower channel and synthesizes the Wilkinson power synthesizer (Wilkinsonpowercombiner) of this two passage output follow on the heels of and is formed.This design work very well and provide a kind of well insensitive structure of load.The switching mode LIPA that Skyworks company proposes has the advantages such as work is good, stability is high, durability is strong, keep load insensitive.But, the PAE that this high efficiency LIPA has is no longer the rival of the WCDMA power amplifier of its like product height PAE.This design has some limitation following:
1. first, switching mode LIPA when highest than single-ended work time trend towards less PAE because Wilkinson power synthesizer is inherently lossy.This inherent loss is partially due to discrete resistance in parallel between two passages.It is so important turning now to PAE, or even the loss of the 0.2-0.3dB relatively relaxed caused due to discrete resistance can not be stood, let alone it is so many to make PAE reduce 2-3%.This is that the most important is not enough.
2. switching mode LIPA mode uses Part I output matching network simultaneously as impedance transformer and phase shifter.This single structure provides the way of multi-functional, is difficult to reach optimum impedance and phase equilibrium accurately simultaneously.
3. upper channel and lower channel are not real separate cause that a degree of tuning difficulty introduced by Wilkinson power synthesizer.This is because upper channel is connected together by Wilkinson power synthesizer with lower channel, wherein the impedance of another passage can be had strong influence by the change of the impedance of a passage, so any impedance adjustment to a wherein passage can affect the impedance of another passage.Switching mode LIPA is so made not allow at that time to go respectively neatly to adjust upper channel and lower channel, for instance, it is impossible to making a wherein passage is also that another passage realizes optimum impedance at low power modes reach optimum impedance when high-power mode while.
4. Wilkinson power synthesizer is also the structure of a kind of large volume, is seized of the real estate of certain values.
Summary of the invention
In order to solve the deficiency that prior art exists, it is an object of the invention to provide a kind of bimodulus enhanced efficiency linear power amplifier.This patent is removed a part of element minimizing number of elements and whole design can be made more cheap, reduces system complexity and improves system reliability.
For achieving the above object, the technical solution adopted in the present invention is:
Bimodulus enhanced efficiency linear power amplifier, two stage power amplifying circuit and output circuit including LIPA structure, wherein, the two stage power amplifying circuit of described LIPA structure is amplified branch circuit by 45 degree of phase shift two-stages and negative 45 degree of phase shift two-stages are amplified branch circuit and constituted, it is characterized in that: described output circuit includes branch circuit A and branch circuit B, described branch circuit A includes inductance L8, electric capacity C6, inductance L10 and electric capacity C5, 45 degree of described phase shift two-stages are amplified branch circuit and are electrically connected with the input of inductance L8, the outfan of inductance L8 is concatenated by the input of electric capacity C6 and inductance L10, one pole of electric capacity C5 is connected with the outfan of inductance L8, another pole ground connection of electric capacity C5；Described branch circuit B includes inductance L9, electric capacity C7 and electric capacity C3, described negative 45 degree of phase shift two-stages are amplified branch circuit and are electrically connected with the input of inductance L9, the outfan of inductance L9 is connected with a pole of electric capacity C3, and a pole of electric capacity C7 is connected with the outfan of inductance L8, another pole ground connection of electric capacity C7；Another pole of electric capacity C3 in described branch circuit B is all connected with power take-off RFOUT with the outfan of the inductance L10 in described branch circuit A.
The method of work of bimodulus enhanced efficiency linear power amplifier, it is characterised in that: when being operated in low-power mode, in order to preserve energy, negative 45 degree of phase shift two-stages are amplified branch circuit and are closed, and all power amplify branch circuit from 45 degree of phase shift two-stages and flow through；When being operated in high-power mode, employ 45 degree of phase shift two-stages and amplify branch circuit and the balanced structure of negative 45 degree of phase shift two-stages amplification branch circuit, input signal will be split into 45 degree of phase shift two-stages and amplify branch circuit and negative 45 degree of phase shift two-stages amplification branch circuit after coming in, after the signal separated is amplified by two above-mentioned branch circuits, it is shifted by so that the signal of separation can carry out homophase mixing in output circuit.
Beneficial effects of the present invention:This patent is the improvement to LIPA power amplifier, in LIPA power amplifier, remains other circuit structure, only output circuit therein has been improved, has had the advantage that
(1) than LIPA, there is higher PAE:
A. for the UMTS frequency band under modulating at WCDMA: under 28dBm high-power mode, its highest PAE is 44%, and the PAE the highest for LIPA of standard only has 41%；Under 16dBm low-power mode, its highest PAE is 21%, and the PAE the highest for LIPA of standard only has 18%.
B. for the CELL frequency band under modulating at WCDMA: under 28.5dBm high-power mode, its highest PAE is 44%, and the PAE the highest for LIPA of standard only has 41%；Under 16dBm low-power mode, its highest PAE is 21%, and the PAE the highest for LIPA of standard only has 18%.
(2) at high-power mode, the insensitive characteristic of load is kept.45 degree of phase shift two-stage amplification branch circuits are different with the impedance that negative 45 degree of phase shift two-stages are amplified in branch circuit, isolate impedance transformation, even under impedance transformation different in aforesaid two branch circuits, can ensure phase equilibrium from phase equilibrium.
(3) at high-power mode, 45 degree of phase shift two-stages are amplified branch circuit and are operated in gain compression state, and negative 45 degree of phase shift two-stages are amplified branch circuit and are then operated in gain extension state, and now it is operated in the areas adjacent of power peak.
(4) removing Wilkinson power synthesizer makes the loss of output matching circuit lower.
(5) in power combing passage (output circuit), only employing a spiral inductance, eliminate two elements, therefore the overall dimensions needed for output network becomes less.Less SMT(SurfaceMountTechnology, i.e. surface mounting technology) number of elements and one prints the spiral inductance of formula so that PA model can be realized under the area of 3mmx3mm；And the LIPA structure of standard is difficult to be compressed to the area of 3mmx3mm.Removing a part of element minimizing number of elements in output circuit can make whole design more cheap, reduces system complexity and improves system reliability.
(6) 45 degree of phase shift two-stages are amplified branch circuit and are optimized for low-power mode individually, have therefore reached to improve the purpose of PAE at low power modes。
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Fig. 1 is the circuit diagram of existing LIPA structure power amplifier；
Fig. 2 is the circuit diagram of the present invention.
Detailed description of the invention
As shown in Figure 2, bimodulus enhanced efficiency linear power amplifier, two stage power amplifying circuit and output circuit including LIPA structure, wherein, the two stage power amplifying circuit of described LIPA structure is amplified branch circuit by 45 degree of phase shift two-stages and negative 45 degree of phase shift two-stages are amplified branch circuit and constituted, it is characterized in that: described output circuit includes branch circuit A and branch circuit B, described branch circuit A includes inductance L8, electric capacity C6, inductance L10 and electric capacity C5, 45 degree of described phase shift two-stages are amplified branch circuit and are electrically connected with the input of inductance L8, the outfan of inductance L8 is concatenated by the input of electric capacity C6 and inductance L10, one pole of electric capacity C5 is connected with the outfan of inductance L8, another pole ground connection of electric capacity C5；Described branch circuit B includes inductance L9, electric capacity C7 and electric capacity C3, described negative 45 degree of phase shift two-stages are amplified branch circuit and are electrically connected with the input of inductance L9, the outfan of inductance L9 is connected with a pole of electric capacity C3, and a pole of electric capacity C7 is connected with the outfan of inductance L8, another pole ground connection of electric capacity C7；Another pole of electric capacity C3 in described branch circuit B is all connected with power take-off RFOUT with the outfan of the inductance L10 in described branch circuit A.
The method of work of bimodulus enhanced efficiency linear power amplifier, it is characterised in that: when being operated in low-power mode, in order to preserve energy, negative 45 degree of phase shift two-stages are amplified branch circuit and are closed, and all power amplify branch circuit from 45 degree of phase shift two-stages and flow through；When being operated in high-power mode, employ 45 degree of phase shift two-stages and amplify branch circuit and the balanced structure of negative 45 degree of phase shift two-stages amplification branch circuit, input signal will be split into 45 degree of phase shift two-stages and amplify branch circuit and negative 45 degree of phase shift two-stages amplification branch circuit after coming in, after the signal separated is amplified by two above-mentioned branch circuits, it is shifted by so that the signal of separation can carry out homophase mixing in output circuit.
1, output network removes Wilkinson power synthesizer, reduces the inherent loss of output matching circuit, thus improve PAE.
2, on power combing passage, eliminate Wilkinson power synthesizer, use spiral inductance, reduce output network size.
3, cancel Wilkinson power synthesizer, directly the power amplifier of two passages is exported and be mixed after carrying out impedance matching and phase shift coupling, counteract third order intermodulation distortion so that its linearity is greatly improved, also make PAE be improved simultaneously.
4, success isolates impedance matching network the structure of output circuit from phase equilibrium network, enables and realizes high PAE under high power and low-power mode simultaneously.
5, in high-power mode, owing to the structure of output circuit isolates impedance matching network from phase equilibrium network, make upper and lower two passages under different impedance matchings, phase equilibrium can be ensured.
6, in high-power mode, the power amplifier of upper channel is operated in gain compression state, and the power amplifier of lower channel is then operated in gain extension state, and now it is operated in the areas adjacent of power peak.
7, individually upper channel is carried out low-power mode optimization, make raising PAE under low-power mode.
Generally speaking, the impedance matching network of separation and phase-shift network, and the passage of high-low power pattern so that no matter under high-power mode or low-power mode, PAE can be greatly enhanced under the premise not sacrificing the linearity.
The above is the preferred embodiment of the present invention; certainly the interest field of the present invention can not be limited with this; should be understood that; for those skilled in the art; technical scheme is modified or equivalent replacement, without departure from the protection domain of technical solution of the present invention.
Claims (2)
1. a bimodulus enhanced efficiency linear power amplifier, two stage power amplifying circuit and output circuit including LIPA structure, wherein, the two stage power amplifying circuit of described LIPA structure is amplified branch circuit by 45 degree of phase shift two-stages and negative 45 degree of phase shift two-stages are amplified branch circuit and constituted, it is characterized in that: described output circuit includes branch circuit A and branch circuit B, described branch circuit A includes inductance L8, electric capacity C6, inductance L10 and electric capacity C5, 45 degree of described phase shift two-stages are amplified branch circuit and are electrically connected with the input of inductance L8, the outfan of inductance L8 is concatenated by the input of electric capacity C6 and inductance L10, one pole of electric capacity C5 is connected with the outfan of inductance L8, another pole ground connection of electric capacity C5；Described branch circuit B includes inductance L9, electric capacity C7 and electric capacity C3, described negative 45 degree of phase shift two-stages are amplified branch circuit and are electrically connected with the input of inductance L9, the outfan of inductance L9 is connected with a pole of electric capacity C3, and a pole of electric capacity C7 is connected with the outfan of inductance L8, another pole ground connection of electric capacity C7；Another pole of electric capacity C3 in described branch circuit B is all connected with power take-off RFOUT with the outfan of the inductance L10 in described branch circuit A.
2. the method for work of bimodulus enhanced efficiency linear power amplifier according to claim 1, it is characterized in that: when being operated in low-power mode, in order to preserve energy, negative 45 degree of phase shift two-stages are amplified branch circuit and are closed, and all power amplify branch circuit from 45 degree of phase shift two-stages and flow through；When being operated in high-power mode, employ 45 degree of phase shift two-stages and amplify branch circuit and the balanced structure of negative 45 degree of phase shift two-stages amplification branch circuit, input signal will be split into 45 degree of phase shift two-stages and amplify branch circuit and negative 45 degree of phase shift two-stages amplification branch circuit after coming in, after the signal separated is amplified by two above-mentioned branch circuits, it is shifted by so that the signal of separation can carry out homophase mixing in output circuit.
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| CN201610246198.0A CN105790720B (en) | 2016-04-20 | 2016-04-20 | Bimodulus enhanced efficiency linear power amplifier |
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| CN201610246198.0A CN105790720B (en) | 2016-04-20 | 2016-04-20 | Bimodulus enhanced efficiency linear power amplifier |
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| CN105790720B CN105790720B (en) | 2018-09-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317978A (en) * | 2023-05-22 | 2023-06-23 | 广东工业大学 | Dual-mode power amplifier, power amplifying method and related equipment thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1874555A (en) * | 2005-05-31 | 2006-12-06 | 华为技术有限公司 | Method and device for raising output power of base station system |
| CN101098127A (en) * | 2006-06-19 | 2008-01-02 | 株式会社瑞萨科技 | RF power amplifier |
| CN102386870A (en) * | 2011-11-16 | 2012-03-21 | 武汉滨湖电子有限责任公司 | Amplitude and phase control equipment and control method for power amplifier |
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2016
- 2016-04-20 CN CN201610246198.0A patent/CN105790720B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1874555A (en) * | 2005-05-31 | 2006-12-06 | 华为技术有限公司 | Method and device for raising output power of base station system |
| CN101098127A (en) * | 2006-06-19 | 2008-01-02 | 株式会社瑞萨科技 | RF power amplifier |
| CN102386870A (en) * | 2011-11-16 | 2012-03-21 | 武汉滨湖电子有限责任公司 | Amplitude and phase control equipment and control method for power amplifier |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317978A (en) * | 2023-05-22 | 2023-06-23 | 广东工业大学 | Dual-mode power amplifier, power amplifying method and related equipment thereof |
| CN116317978B (en) * | 2023-05-22 | 2023-07-21 | 广东工业大学 | Dual-mode power amplifier, power amplifying method and related equipment thereof |
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| CN105790720B (en) | 2018-09-25 |
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Effective date of registration: 20220303 Address after: 510700 Room 305, No. 11, caipin Road, Huangpu District, Guangzhou, Guangdong Patentee after: Zhenzhi microchip (Guangzhou) Technology Co.,Ltd. Address before: 510090 Dongfeng East Road 729, Yuexiu District, Guangzhou City, Guangdong Province Patentee before: GUANGDONG University OF TECHNOLOGY |